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Clock Vine

Thunbergia alata

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Also known as

Black-Eyed Susan Vine

Full Sun
Easy care
Moderate watering
Half-hardy

H3

RHS hardiness

-5°C

Minimum temperature

Expected size

Height
Spread

2.5m

Max

50cm

1m

Min

30cm

Flowering

  • spring
  • summer
  • autumn
  • winter

This plant has no fragrance

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A photo of Clock Vine
A photo of Clock Vine

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Clock Vine Overview

A fast-growing, long flowering creeper with orange, yellow, cream or white flowers with usually a black centre. It is very versatile, can tolerate many types of soil and only uses a moderate amount of water. Commonly known by the names Clock Vine and Black-Eyed Susan Vine. This plant can handle light shade and needs warm conditions to thrive. Attracts insects and birds when flowering in summer. Used in traditional medicine.

Common problems with Clock Vine

Whiteflies, scale, spider mites on indoor plants. These plants are susceptible to powdery mildew fungi, so begin an organic antifungal program if the lower leaves turn brown and twisted. Also bothered by slugs, snails, aphids, powdery mildew, rust and leaf spots.

Clock Vine Companion Plants

Felicia amelloides, Merwilla plumbea, blue Agapanthus, Dietes grandiflora, Carissa macrocarpa, Gardenia thunbergia, Duvernoia adhatodoides (pistol bush) and white Plumbago auriculata

How to harvest Clock Vine

Allow seedheads to dry on plants, remove and collect seeds.

How to propagate Clock Vine

Seed

Sow seeds in shallow holes and cover. Germination takes 10-15 days but germination can be speeded up by soaking seeds in water overnight.

Cuttings

Take herbaceous stem cuttings or softwood stem cuttings in late spring or early summer.

Layering

Simple layering. Using U-bent wire, pin a low-growing stem to the ground, leaving the last 15-30cm of stem exposed. Cover pinned area with soil, bend the tip until vertical & cut bark at the bend.

Special features of Clock Vine

Attracts useful insects

Butterflies, bees, flies and other insects visit flowers for nectar.

Pot plant

Black-eyed Susan can be planted in a container provided with a trellis to grow along.

Hedge plant

It makes a pretty hedge that quickly creep up a fence or other support structure.

Attracts butterflies

Attracts bees

Other uses of Clock Vine

An attractive quick growing garden creeper, ground cover and screen.

Medicinal

Climbers | Waterwise Plants

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